Model 2651A High Power System SourceMeter® Instrument Reference Manual Appendix E: Status model
2651A-901-01 Rev. A / March 2011 E-23
Measurement Event Registers
As shown in the status model's Measurement event registers (on page E-5), there are eight register
sets associated with measurement event status. Commands are summarized in the Status register
sets (on page E-2) topic. Note that bits can also be set by using numeric parameter values. For
details, see Programming enable and transition registers
(on page E-13) .
For example, either of the following commands will set the VOLTAGE_LIMIT enable bit:
status.measurement.enable = status.measurement.VOLTAGE_LIMIT
status.measurement.enable = 1
When reading a register, a numeric value is returned. The binary equivalent of this value indicates
which bits in the register are set. For details, see Reading registers
(on page E-14). For example, the
following command will read the Measurement Event Enable Register:
print(status.measurement.enable)
This register set feeds to bit B0 (MSB) of the Status Byte. The bits used in the Measurement Event
Registers are described as follows:
• Bit B0, Voltage Limit (VLMT): Set bit indicates that the voltage limit was exceeded. This bit will
be updated only when (1) a measurement is taken or (2) the smuX.source.compliance
command is invoked.
• Bit B1, Current Limit (ILMT): Set bit indicates that the current limit was exceeded. This bit will
be updated only when (1) a measurement is taken or (2) the smuX.source.compliance
command is invoked.
• Bit B7, Reading Overflow (ROF): Set bit indicates that an overflow reading has been detected.
• Bit B8, Buffer Available (BAV): Set bit indicates that there is at least one reading stored in
either or both of the nonvolatile reading buffers.
• Bit B11, Interlock (INT): Set bit indicates that interlock was asserted.
• Bit B13, Instrument Summary (INST): Set bit indicates that a bit in the Measurement Instrument
Summary Register is set.
Commands to program and read the register are summarized in the Status function summary
(on
page E-3) table. For more information about the Measurement Event Regi
sters, refer to Status
register sets (on page E-2) and the charts in this appendix.
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